Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Synthesis of 5-O-alkyl-2,3-dehydrosilybins (29–35). Reactants and conditions: i) (a) BnBr (1.1 eq), K2CO3 (4 eq), acetone (0.1 M), argon, reflux overnight; (b) Remove acetone, DMF (0.25 M), BnBr (2.2 eq), K2CO3 (3 eq), rt, 4 h, air; ii) (a) RI or RBr (8 eq), K2CO3 (8 eq), DMF (0.2 M), rt, 4 h; (b) ammonium formate (10 eq), EtOAc and MeOH, Pd/C (20%), reflux, overnight, argon.
